Citroen Relay DPF Guide

Citroen fuel emission blog

Citroen Relay Diesel Particulate Filter 

Welcome to the Auto Assist Blog as easy as 1 2 3, focusing on the Citroen Relay DPF blocked problems in this blog we talk about regeneration, Symptoms, cleaning, fault codes and how long it would take to replace a Relay with DPF Failure. If you require technical support regarding Citroen Relay DPF blocked (DPF) please call 03300100411. Please note that all chemicals used are a professional grade, which is used in conjunction with a specialist machine. All replacement parts are sourced from our partner Xpart. You can also contact us by clicking here for more information.When diagnosing or finding a workaround to a blocked DPF the first thing you could try is regeneration although many times this will not work and a professional clean or replacement will be required.
The first starting point is to identify the symptoms to ascertain if your DPF is at fault….

Symptoms of a blocked DPF

  • Limp mode
  • Difficult starting
  • Bad smells
  • Loss of power
The second step is to try DPF regeneration….

Citroen Relay Regeneration process

  1. The engine is at normal operating temperature
  2. Drive the vehicle at a minimum speed of 40mph for 15 minutes @ 2000 rpm
  3. Once regeneration has completed the DPF light should switch off
The third step …
Have your DPF professionally cleaned, The Auto Assist Group have a fleet of mobile vans nationwide that provide a cleaning service that includes testing and diagnostics,  cleaning of the DPF, offering the additional benefit of removing stubborn carbon deposits, created as part of the vehicle’s regeneration processes, this is without removing the DPF, our mobile equipped DPF Assist vans can do this at your place of work or home.

Benefits of using our DPF cleaning patented technology:

Removal of all residuals including PM10 particles and cerium.Efficient cleaning of all of the types of particulate filter and catalyst.Preservation of the noble metal coatings of the DPF and catalyst.Environmentally friendly process.
If you have access to a good diagnostic scanner, we have put together a troubleshooting guide for soft codes:

The Auto Assist Fault Finding Guide DPF

Fault CodeCause of Fault code
P2002 DPF efficiency below threshold bank 1Short distance driving
P2003 DPF efficiency below thresholdAn air leak will result in sensor readings fluctuations that will trigger the codes
Fuel with high percentage sulphur will contribute to these fault codes
P0470 Exhaust pressure sensor malfunctionBlockage in pipe from sensor to the exhaust
P0471 Exhaust pressure sensor range/performanceEGR valve /air leaks
P242f (if left untreated)Faulty exhaust pressure sensor
P2031 exhaust gas temperature sensor circuit
P2032 exhaust gas temperature sensor low
P2033 exhaust gas temperature sensor high
Loose or corroded connectors or terminals
Broken wires
Faulty sensor
P242f DPF restriction (ash accumulation)Excessive ash accumulation in DPF
Defective DPF pressure sensor
Clogged DPF pressure sensor pipes/hoses
Open or shorted circuit/s in the DPF sensor circuit
Inefficient DPF regeneration
Overuse of engine or fuel system additives
The active DPF regeneration system inoperative
P244a DPF differential pressure too low
P244b DPF differential pressure too high
Insufficient/incorrect diesel exhaust fluid
Open or shorted circuit – DPF pressure sensor
Defective pcm programming
Defective DPF sensor
Faulty DPF
P2458 DPF regeneration duration
P2459 DPF regeneration frequency
Faulty exhaust pressure sensor
Insufficient/incorrect diesel exhaust fluid
Shorted or open wiring to the DPF injection system
Faulty DPF
Open or shorted circuit in DPF pressure sensor circuit
Faulty DPF pressure sensor
The diesel exhaust fluid reservoir may be empty
Improper diesel exhaust fluid
P2455 DPF pressure sensor circuit a highExhaust leaks
Clogged DPF pressure sensor pipes/tubes blocked
P2463 DPF restrictionInoperative active DPF regeneration system
Incorrect installation of new DPF
Incorrect clearance of previous error codes
P2454 DPF pressure sensor a circuit lowExcessive soot accumulation due to insufficient DPF regeneration
Insufficient/incorrect diesel exhaust fluid
Faulty exhaust pressure sensor
P2452/53 DPF pressure sensor a circuit range/performanceThe diesel exhaust fluid reservoir is empty (AdBlue)
Incorrect diesel exhaust fluid
Defective DPF pressure sensor
Clogged DPF pressure sensor pipes/hoses
Open or shorted circuit in the pressure sensor
Inefficient DPF regeneration
Testing the pressure sensor
The location varies from the bulkhead, under the bonnet, back of the engine, or underneath near the DPF above the subframe.You will find 3 wires for the connector which plugs into the sensor.
  1. Constant 5.0 Volt
  2. Earth wire
  3. Trigger pcm wire measuring volts
To test the sensor, either using a multi-meter or diagnostic equipment via the live data stream, measure the volts at engine idle:
  • 0.4-0.5 on engine idle
  • 0.5-0.7 on 2000 rpm revs
  • 0.7-0.9 on 3000 rpm and above
If any of these voltage reading is incorrect then this indicates that the pressure sensor is at fault and needs replacing.Finally, if you need to replace the DPF on the Citroen Relay model – the fitting time of 1.00hrs is recorded if fitted by a competent engineer.

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Citroen Relay DPF Guide